I have an 08.5 crewcab se 4x4 and experience a whistling from the filler neck when I am putting gas in it. It's not just an air hiss, but a full on whistle, other customers could hear it. It is a flex fuel vehicle as well. Anyone else have this happening? I have been to three different gas stations and they all do it. I don't even have 1000 miles on it yet so it might go away, but I figured I'd throw this out there.